Running Django Apps on Heroku

An introduction to running full Django sites on the Heroku platform.

Transcript

1. Running Django Apps on Heroku Randall Degges (@rdegges)
2. Heroku = python + zombies
3. Hosting Yourself vs PaaS Pros • Cheaper. • Teaches your more. • More flexible. Cons • Requires time. • Requires knowledge. • Requires maintenance. • Requires constant revisions (architecture). • Less time for coding. Pros • Simple. • Scalable. • Managed. • More time for coding. Cons • Costly. • You're betting on the company.
4. Getting Started (on Ubuntu) $ sudo aptitude install python-software-properties curl $ sudo apt-add-repository 'deb http://toolbelt.herokuapp.com/ubuntu ./' $ curl http://toolbelt.herokuapp.com/apt/release.key | sudo apt-key add - $ sudo aptitude -y update $ sudo aptitude -y install libpq-dev python-pip heroku-toolbelt ruby git $ sudo pip install -U virtualenv $ heroku login
5. Hello, #pyladies $ mkdir helloladies && cd helloladies $ git init $ echo "Django==1.3" > requirements.txt $ echo "psycopg2==2.4.2" >> requirements.txt $ echo "env" > .gitignore $ virtualenv --no-site-packages env $ . env/bin/activate $ pip install -r requirements.txt $ django-admin.py startproject helloladies $ git add --all $ git commit -m "woot"
6. On.... Heroku! $ heroku create --stack cedar $ git push heroku master
7. Useful Information # View your processes: $ heroku ps # View your logs: $ heroku logs # Run custom stuff: $ heroku run python manage.py syncdb $ heroku run python manage.py shell # Deploy new code: $ git push heroku master
8. Heroku + gunicorn • Real programmers use real web servers. • Let's use gunicorn! $ echo "gunicorn==0.13.4" >> requirements.txt # settings.py - INSTALLED_APPS 'gunicorn', $ echo 'web: python helloladies/manage.py run_gunicorn -b "0.0.0.0:$PORT" -w 3' > Procfile $ git add --all; git commit -m "use gunicorn"; git push heroku master
9. Queue Processing with Celery $ pip install django-celery django-kombu $ pip freeze > requirements.txt # settings.py - INSTALLED_APPS 'djcelery', 'djkombu', # settings.py import djcelery djcelery.setup_loader() BROKER_BACKEND = 'djkombu.transport.DatabaseTransport' CELERY_RESULT_DBURI = DATABASES['default'] $ echo 'worker: python helloladies/manage.py celeryd -E -B --loglevel=INFO' >> Procfile $ git add --all; git commit -m 'use celery'; git push heroku master $ heroku run python helloladies/manage.py syncdb $ heroku scale worker=1 # Verify it's working: $ heroku ps
10. Resources • Django: https://www.djangoproject.com/ • Heroku: http://www.heroku.com/ • gunicorn: http://gunicorn.org/ • celery: http://celeryproject.org/